/**
 * Marlin 3D Printer Firmware
 * Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
 *
 * Based on Sprinter and grbl.
 * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 *
 */
#pragma once

#include "tft_lvgl_configuration.h"

#if ENABLED(MKS_WIFI_MODULE)

#ifdef SERIAL_PORT_2
  #error "SERIAL_PORT_2 must be disabled with TFT_LVGL_UI* and MKS_WIFI_MODULE."
#endif

#define WIFI_BAUDRATE          115200
#define WIFI_UPLOAD_BAUDRATE  1958400
#define USART_SAFE_INSERT

#define WIFI_RX_BUF_SIZE  (1024)
#define WIFI_TX_BUF_SIZE  (64)

#ifdef __STM32F1__

  #include <libmaple/libmaple_types.h>
  #include <libmaple/usart.h>
  #include <libmaple/libmaple.h>
  #include <libmaple/gpio.h>
  #include <libmaple/timer.h>
  #include <libmaple/ring_buffer.h>

  #define DEFINE_WFSERIAL(name, n)\
    WifiSerial name(USART##n, \
    BOARD_USART##n##_TX_PIN,  \
    BOARD_USART##n##_RX_PIN)

  class WifiSerial {
    public:
      uint8 wifiRxBuf[WIFI_RX_BUF_SIZE];

    public:
      WifiSerial(struct usart_dev *usart_device, uint8 tx_pin, uint8 rx_pin);

      /* Set up/tear down */
      void begin(uint32 baud);
      void begin(uint32 baud,uint8_t config);
      void end();
      int available(void);
      int read(void);
      int write(uint8_t);
      inline void wifi_usart_irq(usart_reg_map *regs) {
        /* Handling RXNEIE and TXEIE interrupts.
        * RXNE signifies availability of a byte in DR.
        *
        * See table 198 (sec 27.4, p809) in STM document RM0008 rev 15.
        * We enable RXNEIE.
        */
        if ((regs->CR1 & USART_CR1_RXNEIE) && (regs->SR & USART_SR_RXNE)) {
          #ifdef USART_SAFE_INSERT
            /* If the buffer is full and the user defines USART_SAFE_INSERT,
            * ignore new bytes. */
            rb_safe_insert(this->usart_device->rb, (uint8)regs->DR);
          #else
            /* By default, push bytes around in the ring buffer. */
            rb_push_insert(this->usart_device->rb, (uint8)regs->DR);
          #endif
        }
        /* TXE signifies readiness to send a byte to DR. */
        if ((regs->CR1 & USART_CR1_TXEIE) && (regs->SR & USART_SR_TXE)) {
            if (!rb_is_empty(this->usart_device->wb))
                regs->DR=rb_remove(this->usart_device->wb);
            else
                regs->CR1 &= ~((uint32)USART_CR1_TXEIE); // disable TXEIE
        }
      }
      int wifi_rb_is_full(void);
      struct usart_dev *usart_device;
      private:
      uint8 tx_pin;
      uint8 rx_pin;
  };
  extern WifiSerial WifiSerial1;
  #define WIFISERIAL  WifiSerial1
#else

  #include <inttypes.h>
  #include "Stream.h"
  #include "uart.h"

  class WifiSerial {
    protected:
      // Has any byte been written to the UART since begin()
      bool _written;
      serial_t _serial;
    public:
      uint8_t wifiRxBuf[WIFI_RX_BUF_SIZE];
      uint8_t wifiTxBuf[WIFI_TX_BUF_SIZE];
      WifiSerial(void *peripheral);

      /* Set up/tear down */
      void begin(uint32_t baud);
      void begin(uint32_t baud,uint8_t config);
      void end();
      int available(void);
      int read(void);
      int write(uint8_t);
      
      // Interrupt handlers
      static int _tx_complete_irq(serial_t *obj);
      static void _rx_complete_irq(serial_t *obj);

      void flush(void);
      bool isHalfDuplex(void) const;
      void enableHalfDuplexRx(void);

      private:
        void setRx(uint32_t _rx);
        void setTx(uint32_t _tx);
        void setRx(PinName _rx);
        void setTx(PinName _tx);
        void init(PinName _rx, PinName _tx);
        bool _rx_enabled;
        uint8_t _config;
        unsigned long _baud;
  };
  extern WifiSerial WifiSerial1;
  #define WIFISERIAL  WifiSerial1
#endif // __STM32F1__
#endif // MKS_WIFI_MODULE
